How do I Modify the code snippet below ,so that if a page got a parent page the parent title/link is displayed instead in wordpress

Question

add_filter('avf_title_args', 'fix_page_title', 10, 1);
function fix_page_title($args) {

    $args['title'] = get_the_title();
    $args['link'] = get_permalink();

    return $args;

}

Answer 1

You can check for a parent using $post->post_parent and get the title using get_the_title() :

add_filter('avf_title_args', 'fix_page_title', 10, 1);
function fix_page_title($args) {
    global $post;

    if($post->post_parent){
        $args['title'] = get_the_title();
    } else {
        $args['title'] = get_the_title( $post->post_parent );
    }
    $args['link'] = get_permalink();

    return $args;

}

Or:

$args['title'] = get_the_title($post->post_parent ?: NULL);